Sergei Golyshev (AFK during workdays)
Laboratorium Solaris: QHY Sun
The Sun was very interesting this morning. My personal fave is a long thin filament encircling the sunspot AR 2106. But I also like the obvious spiralling patterns around 2109, 2108 and 2111.
So it just happenend very good for firstlighting my new QHY5L-IIm camera :D
WARNING! Sun is dangerous, use proper filters for observing and imaging!
This is how this was done...
Aquisition time (start of the session) : JD2456846,78288194 (08.07.2014 10:48:21 MSK).
Image orientation: mirrored (why?!)
Equipment:
QHY5L-II monochrome CMOS camera in prime focus Coronado PST on photo tripod via Manfrotto 410 Junior geared head.
Aperture 40 mm
Native focal length 400 mm
Tv = 1 ms
Av = f/10
ISO NA
Gain 20 out 1000 (SharpCap convention)
Exposures: about 60-100 out of 120-200 from three movies (I let the Sun drift across the field of view at different "latitudes")
Processing: three resulting movies were processed in Autostakkert!2. Resulting image was subjected to Richardson-Lucy deconvolution in AstraImage 3.0 (Cauchy type PSF, size 2 units, 6 iterations). Deconvolved images were stitched in Microsoft ICE.
High-pass filtering was made in Photoshop.
Note 1: A bit of simple math now.
The solar disk is 1800 arcseconds wide and fits in 977 pixels on this image.
Optical resolution of PST is
Rd = 140/40 = 3,5"
This means that the Sun contains 1800/3,5 = 514 resolvable units. Reileigh resolution in this combo is achieved then the solar disk's size becomes larger than 1028 pix. Very good value is 1466 which is 1,5x extra magnification or 600 mm effective focal length. Using 2x Barlow lens will go up to 1954 pix which is a bit too much, but since I have such a lens it can be tried instantly :)
Laboratorium Solaris: QHY Sun
The Sun was very interesting this morning. My personal fave is a long thin filament encircling the sunspot AR 2106. But I also like the obvious spiralling patterns around 2109, 2108 and 2111.
So it just happenend very good for firstlighting my new QHY5L-IIm camera :D
WARNING! Sun is dangerous, use proper filters for observing and imaging!
This is how this was done...
Aquisition time (start of the session) : JD2456846,78288194 (08.07.2014 10:48:21 MSK).
Image orientation: mirrored (why?!)
Equipment:
QHY5L-II monochrome CMOS camera in prime focus Coronado PST on photo tripod via Manfrotto 410 Junior geared head.
Aperture 40 mm
Native focal length 400 mm
Tv = 1 ms
Av = f/10
ISO NA
Gain 20 out 1000 (SharpCap convention)
Exposures: about 60-100 out of 120-200 from three movies (I let the Sun drift across the field of view at different "latitudes")
Processing: three resulting movies were processed in Autostakkert!2. Resulting image was subjected to Richardson-Lucy deconvolution in AstraImage 3.0 (Cauchy type PSF, size 2 units, 6 iterations). Deconvolved images were stitched in Microsoft ICE.
High-pass filtering was made in Photoshop.
Note 1: A bit of simple math now.
The solar disk is 1800 arcseconds wide and fits in 977 pixels on this image.
Optical resolution of PST is
Rd = 140/40 = 3,5"
This means that the Sun contains 1800/3,5 = 514 resolvable units. Reileigh resolution in this combo is achieved then the solar disk's size becomes larger than 1028 pix. Very good value is 1466 which is 1,5x extra magnification or 600 mm effective focal length. Using 2x Barlow lens will go up to 1954 pix which is a bit too much, but since I have such a lens it can be tried instantly :)